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STUDY ON HIGH ACID LEACHING REACTIVE CALCINED KAOLIN

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Journal of Wuhan University of Technology(Materials Science) 1999年第1期14卷 19-24页

作者： zhang, qichun Yi, Qiaoming Chengdu Inst Technol Dept Mat Sci & Engn Chengdu 610059 Peoples R China

Leaching experiments on metakaolin show that the final Al extraction ratio reached in a batch reaction is strikingly influenced by the inferior pore structure geometry of the metakaolin pellets. By calcining kaolin particles adhered in low humidity state, a variety of metakaolin pellet, inside which a large openings structure developed, has been prepared. The structure remarkably benefits leachant ion transference, so, the variety has high acid leaching reactivity, even coarse as the pellets are, its aluminum extracted ratio still has a linear relationship with leaching time, and the leaching kinetics is maintained zero order up to a significant conversion degree. A revised Pellet-Particle Model has been developed to interpret the structure influence on Al extraction ratio. (Author abstract) 4 Refs.

关键词： large openings structure aluminum extraction reactivity

Manipulating asymmetric photon transport through electrical control： a new strategy to construct optical diodes or isolators

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Science China Chemistry 2018年第11期61卷 1351-1352页

作者： Yinjuan Huang qichun zhang School of Materials Science and Engineering Nanvang Technological University Singapore 639798 Singapore Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University Singapore 639798 Singapore

Nowadays, the main barrier which restricts the applications of integrated photonics for construction of optical diodes or isolators in photonic integrated circuits is the effective asymmetric photon transport. Accordingly, a series of photonic schemes have been developed to break this conundrum [1,2]. On the other hand, exciton polariton （EP） formed through the strong coupling between photons and exitons can propagate along the waveguide, which can therefore provide schemes to manipulate photons at microscale [3].

关键词：光二极管控制操作不对称光子运输构造集成电路波导

Organic quantum materials:A review

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SmartMat 2023年第4期4卷 10-36页

作者： Xin Wang qichun zhang Department of Materials Science and Engineering City University of Hong KongHong KongChina

Interests in organic quantum materials(OQMs)have been explosively growing in the field of condensed physics of matter due to their rich chemistry and unique quantum *** are strongly correlated systems and show novel electromagnetic performance such as high-temperature superconducting,quantum sensing,spin electronics,quantum dots,topological insulating,quantum Hall effects,spin liquids,qubits,and so forth,which exhibit promising prospects in information communication and thus facilitate the construction of a modern intelligent *** article reviews recent developments in the research on the electromagnetic characteristics of *** mainly give an overview on the progress of superconductors and quantum spin liquids based on organic materials and describe their possible *** experimental findings exhibit new exciton interactions and provide insights into exotic electronic ***,their association and strategies for realizing multiple quantum states in one system are discussed.

关键词： organic quantum materials spin liquids superconductors

Carbon and carbon composites for thermoelectric applications

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Carbon Energy 2020年第3期2卷 408-436页

作者： Yichuan zhang qichun zhang Guangming Chen College of Materials Science and Engineering Shenzhen UniversityShenzhenP.R.China School of Materials Science and Engineering Nanyang Technological UniversitySingapore Department of Materials Science and Engineering City University of Hong KongKowloonHong Kong SARChina

The urgent need for consistent,reliable,ecofriendly,and stable power sources drives the development of new green energy ***(TE)materials receive increasing attention due to their unique capability of realizing the direct energy conversion between heat and electricity,showing diverse applications in harvesting waste heat and low-grade *** materials such as carbon nanotubes(CNTs)and graphene have experienced a rapid development as TE materials because of their intrinsic ultrahigh electrical conductivity and light ***,polymer-based carbon composites are particularly fascinating as the combination of the merits of polymers and filler materials leads to high TE performance and superior ***,the recent TE advances are systematically summarized in the studied popularity of carbon materials(ie,CNTs and graphene)and the category of *** conducting polymer-based carbon materials are particularly ***,the remaining challenges and some tentative suggestions possibly guiding future developments are proposed,which may pave a way for a bright future of carbon and carbon composites in the energy market.

关键词： carbon nanotubes conducting polymers graphene thermoelectric materials thermoplastic polymers

Recent advances on electrochemical methods in fabricating two-dimensional organic-ligand-containing frameworks

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SmartMat 2021年第3期2卷 299-325页

作者： Xiang Wang Pengfei She qichun zhang Department of Materials Science and Engineering City University of Hong KongHong KongChina Center of Super-Diamond and Advanced Films(COSDAF) City University of Hong KongHong KongChina

Organic-ligand-containing frameworks have drawn considerable attention due to their multifunctional properties as well as tunable structures for broad *** numerous synthesis methods developed in the past two decades,electrochemical processing has been demonstrated as one of the most efficient,safe,and facile ways to realize the large-scale and highly controllable production of organic-ligand-containing *** this review,the progress of electrochemically induced crystallization and thin film fabrication of organic-ligand-containing frameworks is summarized in a well-rounded ***,the mechanism and processing parameters are also ***,the main challenges are also expounded for providing some guidance on the future development of organic-ligand-containing frameworks,especially for covalent-organic frameworks and hydrogen-bonded organic frameworks.

关键词： covalent organic frameworks electrophoretic deposition electrosynthesis films hydrogen-bonded organic frameworks metal-organic frameworks

Emerging two-dimensional Mo-based materials for rechargeable metal-ion batteries:Advances and perspectives

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Journal of Energy Chemistry 2024年第2期89卷 487-518,I0012页

作者： Qingqing Ruan Yuehua Qian Mengda Xue Lingyun Chen qichun zhang Department of Applied Chemistry School of Chemistry and Chemical EngineeringChongqing UniversityChongqing 401331China Department of Materials Science and Engineering City University of Hong Kong999077Hong KongChina

With the rapid development of rechargeable metal-ion batteries(MIBs)with safety,stability and high energy density,significant efforts have been devoted to exploring high-performance electrode *** recent years,two-dimensional(2D)molybdenum-based(Mo-based)materials have drawn considerable attention due to their exceptional characteristics,including low cost,unique crystal structure,high theoretical capacity and controllable chemical ***,like other transition metal compounds,Mo-based materials are facing thorny challenges to overcome,such as slow electron/ion transfer kinetics and substantial volume changes during the charge and discharge *** this review,we summarize the recent progress in developing emerging 2D Mo-based electrode materials for MIBs,encompassing oxides,sulfides,selenides,*** introducing the crystal structure and common synthesis methods,this review sheds light on the charge storage mechanism of several 2D Mo-based materials by various advanced characterization *** latest achievements in utilizing 2D Mo-based materials as electrode materials for various MIBs(including lithium-ion batteries(LIBs),sodium-ion batteries(SIBs)and zinc-ion batteries(ZIBs))are discussed in ***,the modulation strategies for enhancing the electrochemical performance of 2D Mo-based materials are highlighted,focusing on heteroatom doping,vacancies creation,composite coupling engineering and nanostructure ***,we present the existing challenges and future research directions for 2D Mo-based materials to realize high-performance energy storage systems.

关键词： Molybdenum-based materials Two-dimensional materials Lithium-ion batteries Sodium-ion batteries Zinc-ion batteries

Recent advances on π-conjugated polymers as active elements in high performance organic field-effect transistors

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Frontiers of physics 2021年第3期16卷 33-64页

作者： Lixing Luo Wanning Huang Canglei Yang Jing zhang qichun zhang Key Laboratory for Organic Electronics and Information Displays&Institute of Advanced Materials Jiangsu National Synergetic Innovation Center for Advanced MaterialsNanjing University of Posts&TelecommunicationsNanjing210023China Department of Materials Science and Engineering City University of Hong KongKowloonHong Kong SAR999077China

As high-performance organic semiconductors, π-conjugated polymers have attracted much attention due to their charming advantages including low-cost, solution processability, mechanical flexibility, and tunable optoelectronic properties. During the past several decades, the great advances have been made in polymers-based OFETs with p-type, n-type or even ambipolar characterics. Through chemical modification and alignment optimization, lots of conjugated polymers exhibited superior mobilities, and some mobilities are even larger than 10 cm^(2)·V^(−1)·s^(−1) in OFETs, which makes them very promising for the applications in organic electronic devices. This review describes the recent progress of the high performance polymers used in OFETs from the aspects of molecular design and assembly strategy. Furthermore, the current challenges and outlook in the design and development of conjugated polymers are also mentioned.

关键词： conjugated polymers p-type polymer n-type polymer ambipolar transport high-ordered alignment

Our research progress in heteroaggregation and homoaggregation of organicπ-conjugated systems

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Aggregate 2021年第3期2卷 40-53页

作者： Xin Deng Xiaohui Yu Jinchong Xiao qichun zhang College of Chemistry and Environmental Science Key Laboratory of Chemical Biology of Hebei ProvinceKey Laboratory of Medicinal Chemistry and Molecular DiagnosisMinistry of EducationHebei UniversityBaodingP.R.China Department of Materials Science and Engineering City University of Hong KongHong KongP.R.China

Construction of crystalline homo/heteroaggregation at micro/nanometer level from organicπ-conjugated systems is of great importance because the controllable morphologies(i.e.,size,shape,and dimension)could provide diverse optoelectronic properties for different applications in the electrooptical *** this review,we summarize our recent progress in the self-assembly of micro/nanostructures of organicπ-conjugated molecules via the heteroaggregation and homoaggregation *** also discuss various factors(i.e.,temperature,solvents,and surfactants)that affect the aggregation process through a surfactant-assisted reprecipitation ***,their physical properties and possible applications in electronics and biofields are illustrated.

关键词： arene hetero/homoaggregation organic device photophysics self-assembly

Recent advances in vacancy engineering of metal-organic frameworks and their derivatives for electrocatalysis

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SusMat 2021年第1期1卷 66-87页

作者： Yuhang Wu Yuwen Li Junkuo Gao qichun zhang School of Materials Science and Engineering Institute of Functional Porous MaterialsZhejiang Sci-Tech UniversityHangzhouP.R.China Department of Materials Science and Engineering City University of Hong KongKowloonHong KongP.R.China

The efficient electrocatalysis plays the key role in the development of electrochemical energy conversion technologies to alleviate energy *** their multiple active sites and large specific surface areas as electrocatalysts,metalorganic frameworks(MOFs)and their derivatives have attracted considerable interests in recent ***,exploring the roles of the enhanced active sites inMOFs and their derivatives is significant for understanding and developing new effective ***,the vital role of vacancies has been proven to promote electrocatalytic processes(such as H2 or O2 evolution reactions,O2 reduction reactions,and N2 reduction reactions).In order to in-depth exploring the effect of vacancies in electrocatalysts,the vacancies classification,synthetic strategy,and the recent development of various vacancies inMOFs and their derivatives for electrocatalysis are ***,the perspectives on the challenges and opportunities of vacancies inMOFs and their derivatives for electrocatalysis are presented.

关键词： active sites defect derivatives electrocatalysis metal-organic frameworks vacancy